With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swSredGlobalState
Switch Sred Global State
1.3.6.1.4.1.171.12.51.1.1
This object enables/disables the Simple RED state of the device.
Back to SRED-MIB MIB page.
IPHost Network monitor allows you to monitor swSredGlobalState on D-Link device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring D-Link VPN routers right now.